Dental plugger



(No Model.)

1:. M, STROUD. DENTAL PLUGGBR.

No. 420,745. A Patented Peb. 4,1890.

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UNITED STATES PATENT FFICE.

EDWARD M. STROUD, OF PITTSTON, ASSIGNOR TO THE S. S. WHITE DENTAL MANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA.

DENTAL PLUGGER..

SPECIFICATION forming part of Letters Patent No. V420,745, dated February 4, 1890. Application filed November 12, 1889i Serial No.329,995. (No modeld To all whom it may concern:

Be it knownthat I, EDWARD M. STROUD, of Pittston, in the county of Luzerne and State of Pennsylvania, have invented a certain new and useful Improvement in Dental Pluggers,

ot' which the following is a specification. My invention relates to that classof hand dental pluggers which are provided with spring-actuated ham mers for imparting blows, 1o t-he force of which may be regulated to plungers carrying the'plugging-po'ints and supported within sliding sectional casings.

My improvement, as hereinafter claimed, consists in a novel organization of devices by means of which I produce asimply-constru cted and efficiently-operating plugger.

In the accompanying drawings, which show suitable organizations of mechanism embodying my improvement in both single and double zo acting pluggers, Figure l is a longitudinal View of a single-acting plugger; Fig. 2, a view showing most of the parts in longitudinal central section; Fig. 3, a longitudinal view showing the internal mechanism and other parts of the instrument, the hand-piece casing-section and nose-piece casing-section being detached. Fig. t represents the handpiece casing-section in longitudinal central section, and Fig. 5 shows the nose-piece cas- 3o ing-section detached. Fig. 6 is a longitudinal view of a double-acting plugger having my improvement applied thereto in slightlymoditied form; and Fig. 7, a longitudinal view of the double-acting plugger, showing most of the parts in central section.

Referring now to Figs. l to 5, inclusive, A is the handpiece section of the casing, which is connected at its outer end with the short casing-section A', screwed therein and carry- 4o ing the screw-attached nose-piece section B of the casing. The plunger B', to the end of which is applied the plugging tool` or point() in any suitable way, is carried by the reciprocatin g sectional casing. The plunger is provided with a shoulder or collar u, normally resting against the inner end of the nosepiece of the sectional casing, to which it is pressed by the spring b, which is confinedv tween said shoulder and an internal shoulder 5o c of the plunger-bearing formed by the reduced end of the casing-section A The plunger is recessed or cut away at D and provided with the shoulders d CZ at opposite ends of its cut-away portion. At the inner end of the 5 5 plunger is fitted a spring-actuated hammer E, adapted to slide and strike upon the plunger. The hammer-actuating spring E bears at one end on the inner end of the hammer, and at its opposite end is borne upon and rendered 6o adjustable to Vary the force of the' blows imparted to the plunger by a centrally-perforated and screw-threaded disk or nut F, through and in which works an adjustingscrew F. By turning this screw one way or the other the disk or nut may be moved in cit-her direction within and lengthwise of the hand-piece section of the casing to vary the tension of the spring and. regulate the force with which it acts. The nut is prevented from 7o turning and is guided by means of a lug or projection e at its edge engaging and sliding in a groove c, in the hand-piece-casing section. The shank or unthreaded portion of the ad j listing-screw passes through and turns in a screw-plug or cap-piece f, secured in the end of the hand-piece section of the casing, andis provided with the milled head G for turning it.

To adapt the plunger and its striking-ham- 8o mer for co-operation, so that pressure upon the plugging-'point will cause the hammer to act, devices such as next to be described are provided.

At its cut-away or recessed portion D the plunger is provided with a spring-latch G', secured at one end by a screw g to the plunger and at its opposite or inner end normally projecting outwardly or away from the plunger to the limit of movement allowed it, in 9o which position it is against or close to the outer end of thehammer. This latch is made to serve as the medium for retracting the hammer and compressing its actuating-spring by pressure on the plugging-point and for releasing the hammer to allow blows to be struck upon the plunger. Alatch-tripper occupying a fixed relation to the sliding casing and serving to force the inner or free end of the latch inward or toward the plunger for releasing the hammer is shown as formed by an inclined lug 7i, projecting toward the plunger and secured within the sectional casing by an arm H, with which it is formed. The carrying-arm of the latch-trippinglug is fixed close to or `in contact with the hand-piece casingsection bya screw h, attaching it to the inner end or bearing portion of the casing-section A', and this securing-screw is made to serve as a stop, against which the plunger-sho ulder d abuts to limit movement of the sliding sec` tional casing toward the plugging-point. At its inner end the tripping-lug arm H acts as a stop to limit the outward movement of the hammer, which normally abuts against it. A recess I, so formed as to constitute an incline z' on the outer surface of the free end of the spring-latch, is entered by the tripping-lug, which normally rests in the recess in advance of or out of contact with the incline, as shown by the drawings.

From the above description it will be seen that when in operatin g the plugger the plugging-point is pressed upon with sufficient force the sectional casing, and with it the tripping-lug, is moved inward, and the springlatch is caused to act on the hammer to retract it, and thereby compress its actuatingspring. As the retracting movement of the hammer is completed, t-he tripping-lughaving by its action on the incline of the latch pressed this latch at its free end toward the plunger far enough to come in line with the plungeropening in the hammer, the hammer is released and left free to be acted on by its spring, and thus made to strike a blow upon the plunger. After each blow is struck the parts are left in the positions in which they are represented in the drawings for repetition of the above-described operation.

In Figs. 6 and 7, showing a doubleacting plugger, the plunger B is made of a length sufficient to allow it to project at each end of the casing and is adapted to receive a backacting plugging-point J at one end in addition to the direct-acting plugging-point C at the opposite end. In this form of tool the casing-section A and its contained spring are omitted, thus reducing the length of the instrument. rlhenose-pieceB is increased in diam eter and screwed directly to the hand piece casing-section. A screw J in the nose-piece and passing through a slot in the plunger serves to limit the sliding movement of the casing. The tripping-lug arm H is secured inposition by screwingl it into the nose-piece at k. The hammer E has the opening for the plunger extending entirely through it, instead of only part way through, as before, and is provided midway its length with a slot K, through which passes a cross-pin L, secured in and passing through the plunger. The blow ot' the hammer is imparted to the plunger by means of this pin L. The hammer-actuating spring E is confined between the hammer and the lianged or shouldered end m of an externally-threaded sleeve M, adjustable within and endwise of the hand-piece section of the casing. Lugs on the flanged end of this sleeve are received in the grooves in the hand-piece casing to prevent turning of the sleeve. An adjusting-sleeve N, shouldered midway its length to constitute two portions of diierent diameters, has its larger portion internally threaded for engagement with the screw-thread upon the adjustable sleeve. A threaded sleeve O, having a milled head, screws into the end of the hand-piece casing-section around the reduced portion of the adjusting sleeve N. A sleeve p, provided with an elongated head P, constituting a nose-piece bearing for the plunger, is fitted within the reduced portion of the adj ustingsleeve, with the head P resting upon the head of the sleeve O. The inner end of this nosepiece sleeve abuts against one end of the spring h,which acts with a tendency to maintain the sliding sectional casing and the plunger in their normal relative positions. At its opposite end this spring bears against a collar Q, secured by a screw q to the plunger. The nose-piece sleeve p is adapted, in any suitable way, to turn the adj usting-sleeve N, through or by means of which the adjustable sleeve M is actuated to increase or lessen the tension ot' the hammer-actuating spring. The nose-piece sleeve may be engaged with the adjusting sleeve by forcing it tightly in place within the smaller portion of the adj ustingsleeve, so that the frictional contact between these parts will cause any turning movement of the nose -piece sleeve to be imparted to the adj usting-sleeve, and thus move the adjustable sleeve lengthwise of the hand-piece section of the casing.

IOO

Obviously, instead of depending merely i upon frictional contact between the parts, the nose-piece sleeve and the adjustingsleeve may be detachably connected with each other by means of a short screw or readily-removable pin.

It will be apparent that the double-acting plugger operates substantially as already explained with reference to Figs. l to 5, the hammer being thrown into action either by a thrusting pressure upon the direct-acting plugging-point or by a pulling strain on the back-actin g plu ggin g-point.

It will be obvious that by providing the plunger with the recessed or cut-away portion I am enabled to locate the spring-latch and the tripping-lug opposite each other, and maintain them in contact while attaining a compact and simple construction of parts.

I claim as my invention- 'lhe combination of the sectional casing, the spring-actuated hammer, the cut-away plunger, the spring-latch secured at one end to the cut-away portion of the plunger and at its opposite end projecting outwardly there- IIO from, provided With the incline and acting on the hammer to retract it, and the tripping-lug having connection with the `easing and in Contact With which the spring-latch is maintained, and by which 111g said latch is causedto release the hammer, substantially as and for the purpose set forth.

In testimony whereof I have hereunto sub-V scribed my name.

EDWARD M. STROUD. Witnesses:

W. B. PAGGART, T. R. STALEY. 

